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PROTOCOLS(5)               Linux Programmer's Manual              PROTOCOLS(5)

       protocols - the protocols definition file

       This  file  is  a plain ASCII file, describing the various DARPA internet protocols
       that are available from the TCP/IP subsystem.  It should be  consulted  instead  of
       using  the  numbers  in the ARPA include files, or, even worse, just guessing them.
       These numbers will occur in the protocol field of any IP header.

       Keep this file untouched since changes would result in incorrect IP packages.  Pro-
       tocol  numbers  and  names  are  specified  by  the IANA (Internet Assigned Numbers

       Each line is of the following format:

              protocol number aliases ...

       where the fields are delimited by spaces or tabs.  Empty lines are ignored.   If  a
       line  contains a hash mark (#), the hash mark and the part of the line following it
       are ignored.

       The field descriptions are:

              the native name for the protocol.  For example ip, tcp, or udp.

       number the official number for this protocol  as  it  will  appear  within  the  IP

              optional aliases for the protocol.

       This  file  might be distributed over a network using a network-wide naming service
       like Yellow Pages/NIS or BIND/Hesiod.

              The protocols definition file.


       This page is part of release 3.22 of the Linux man-pages project.  A description of
       the  project, and information about reporting bugs, can be found at http://www.ker-

Linux                             2008-09-23                      PROTOCOLS(5)

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